The general approach for UV-Vis spectra with DFT is Time-dependent DFT (TDDFT).

Here is a tutorial on it:

https://www.quantum-espresso.org/tutorials/shanghai-2013/hands-on-tddft/

Please be aware that TDDFT does not always result in fitting results.

give if any alternative calculation

Again a question/discussion that is too generic to receive a simple answer. Again there are different tools and options, so you need to be more specific. For a start

1) system you want to study, bulk, 2D molecule

2) physics you want to describe, excitons plasmon, and so on

A comment on which code you did use and know would've been a bonus, as well as the computational machine you want to use.

Regards,

Roberto

1. Bulk

2. TDDFT (recently use this code) i7 16 Ram Ubundu