Debora, on the one hand, you will get as many answers as there are interpretations of Marx's labor theory of value. On the other you need to clarify what you mean by "reach" in your question "how can we reach the obstacles for overproduction and the limits of capital?" As for the "limits of capital" those can only be overcome by the overthrow of capitalism; they are inherent.

With respect to the "impact of the realization of commodities on wages", because "realization" is nothing more than their sale, the impact depends on WHAT is being sold, at what PRICE and the consequences for real wages, i.e., what workers can actually buy. For example, during the long period of rapid industrialization in the USSR - a state capitalist regime - when surplus value was mainly being invested in basic industry, consumer good production was secondary, which limited workers real wages because they had little to buy and had to fall back on subsistence production on their little plots of land. This didn't change until mass protests forced the regime to redirect investment into the production of consumer goods.

With respect to "How labor and overproduction is related to the value crisis?" How one answers depends on the interpretation of "the value crisis". If you interpret the labor theory of value as I do, as a theory of the value of labor to capital, then the "value crisis" might be a crisis in the ability of capital to impose sufficient labor to maintain accumulation understood as expanding social control. In that case, because overproduction = more commodities being produced than can be sold, the usual result is a reduction in the ability of capitalists to put workers to work, to extract labor and surplus labor because of the consequent reduction of production and layoffs/firings of workers - this whether we are talking about the individual firm or production in the aggregate.

I think the crisis of overproduction is being met by increasing the rapidity of transactions (multiplying the transactions) by a small percentage of the global market under the impact of internet connections and increased commodification of delivery and home services, basically, rather than expansion of the number of buyers in the market. If you consider the African continent (home to about 25% of the world's population) and much of Latin America, and India, most of the world's people are not in the capitalist labor force. Most are in the so-called informal sector - organized by domination/oppression, not wage labor.

I would agree with Marx, the cost of labor is determined by the cost of reproduction of the worker - by cost of subsistence - so not a direct relationship between value realization and wages. Lots of value does not mean wages will go up unless a certain type of worker must be reproduced and temporarily if a shortage exists. Today, only a relatively small number of fully developed capacity workers are needed, and their lifestyle costs a lot, so their cost of reproduction wage is way above subsistence. However, a large portion of the existing workforce is struggling to maintain subsistence level, so much so that a guaranteed income in the U.S. capitalist core, is conceived to prevent political crisis as wages generalize across the global system stagnant in the face of inflating prices.

With respect to "How labor and overproduction is related to the value crisis?", since the secular trend to replacement of workers by technology creates the change in the "organic composition of capital," whereby more materials are passed through (higher capitalization) with less added labor (variable capital), huge amounts of good with tiny amounts of value added must be sold to realize the same amount or comparable amount of surplus value as when more labor was utilized. Conditions of surplus labor and labor paid at the global average endanger realization of value as they cannot pay even low market prices.

It seems to me that as the amount of surplus labor in the form of the informal sector grows globally, the key for America and Europe is to keep the starving masses away from them (don't report on them in the media) and to take over feeding their own surplus populations, using taxes to provide income which they can then spend. But sometimes the middle-class high paid workers revolt against paying taxes to feed the poor. Militarism helps because the middle-class understands that armed domination is necessary and are willing to feed the people as armed forces.

In other words, since the workforce is global, only a few leading functions require core sector workers, and the rest of the workforce wages across the system, are declining in relative terms. Perhaps the system will reach crisis change when the surplus level reaches enough people with some skill who will refuse the labor for wages and demand their right to capital (to "own" it, i.e., control it according to their needs not profitability) in the form of land, natural resources, market places like Amazon, as well as productive capacity, and share it for self-reproduction, in an arrangement absent the pressure of market competition or forced centralization of capital.