Is there someone in the banner that you want so bad ? if yes do it, if no don't do it.

I recommend saving your SQ since upcoming banners/events will include another lottery event as well as a new Lostbelt chapter featuring Super Orion. Can’t forget Space Ishtar either.

If you want a future look into the upcoming banners/events check it out by searching it in the fandom to see if there are servants you want to save SQ for for the future.

I recommend not doing it if you dont have any servants that you want in the banner. If you are looking for servants that can help you in farming its best to wait for astarte or spishtar and theres also super orion in december

what does farming mean?

Mean that you play the same battle many times to get some materials with these materials you can upgrade your servant