For petty services where you don't want to have to break out the password manager, try making your own mental salted hash.

Pick four long words at random. Assign each of these to the four quadrants of the alphabet.

A-F - Equipment

G-M - Triumphant

N-S - Sampling

U-Z - Fatigued

Pick one number:

4

Now, take the first letter of the service that the password is for, and that selects your quadrant word. Take the number of letters in the service and multiply it against your number. Take the last letter of the service, and on your querty keyboard, move all the way to the right of thst line to select the first symbol there. Thats your unique password thats salted with yo ur personal words and number.

Facebook = Equipment32:

Lemmy = Triumphant20{

Pizza Hut = Sampling36{

If you want more security for these petty services, use longer words, bigger number, or use some other metric, Tweak the algorithm to make it unique to you. Maybe capitalize a middle letter in your salt word based on the length of the service name. Maybe add the first letter of the colour of the service logo to the password, EG

Facebook = Equipment32:B

Lemmy = Triumphant20{T

Pizza Hut = Sampling36{R

Petty services I would consider to be anything that's not super critical, and is at a higher likelyhood of breaching my shit.

For banks, primary emails, or government services, use a more complex algorithm or a random string of chars from your password manager.