I don't think he will go back to his 2018 for form. However I do think this year was a perfect year for no fans in the stands. It did help him learn. He will take what he learned this year and be even better next year.
The Bills need a PR/KR. He showed that he can do that in the Miami game. He also played WR and sort of RB. Remember they are getting Hodgins back. Thats like a free draft pick. Trust the process.