Attempting to repair lag and nothing appears to work

I’m on a 2019 Galaxy Tab A and I simply began utilizing it once more after not even touching it for a yr and now I come again and replace it and nothing appears to work nicely in any respect. I’m continuously crashing on sure apps and video games and those who don't appear to run on at the very least 200 ping nonstop. Does anybody know anybody or something that may assist repair?