Step 1: clean out the lint from the charging port
Step 2: make sure you actually got all the lint out and there isn’t any hiding to the side.
The sim ejector pin that used to come with phones can sometimes just barely fit between the center blade and connector housing. Otherwise a paperclip with a slight hook bent into the end can work well. Flosspicks work well to dig out the lint.
Also consider getting a wireless charger for nightly charging if your phone supports it.
It’s one-sided…