May I draw your attention to one older question, which is still not answered? Thank you! https://www.researchgate.net/post/what_is_the_acceptable_R2_value
If you are trying to identify the relationship between dependant and independant variables you can go for analysis of variance and F-test to see the significancy of the relationship some times you have high R2 but might statistically be insignificant or you might get very low R2 but it is statistically significant this link might answer your question