This happens on the freemium version of Heroku. You have 3 options that I can think of.
Host the bot on your local Windows machine instead. (The best option imo)
Buy Heroku Premium
Learn Heroku Postgres (Depends on what you want, look at the free plan and how much they are limiting you, I never looked into this myself just because it was such a big rabbit hole)
Hello when I host bot for 24h after 1day or 2 days all setups rest like channel and description Can you help me how to fix it I host on heroku