despite being such a long time playing it i have a hard time to keep the reputation high. i even tried to edit it somehow through the debug mode but i couldnt find it any longer... any tips ?
You already got a reply on where to find your reputation in debug so I don't need to go there.
What I found I needed to do to keep my reputation up in the game:
Stay in the conservative clothing for quite some time. keeps from the random hit while walking around town. You can go commando though.
Make sure your arousal doesn't get so high that townspeople notice your excitement, also a hit on rep.
Don't smack Carmen's ass when she trips, totally extreme 10 point hit.
Keep your students in the normal school clothes, they will reflect their inhibition anyway so no need to switch them except to trigger events. I like to do sexy Thursdays and nude Fridays though.
feed them normal food, keep student to student relationships forbidden, all these help the town think you are doing a good job.
Accept all students, it sucks that the school will grow up to the 400 max so you will need to sort your classes every now and then so like minded students are in the same class. keeps the random rep hit from a student doing something lewd in a classroom that all isn't ready to look on eagerly.
Always do the work on paperwork rep building choice. Save before as sometimes you miss something and you get a hit.
Do the Rie tutoring quest pretty early, gives rep both days on the weekend, and then when you add Hana, another rep boost. I like to go Hana, June, then Rie, and for the Rie quest, have her meet you downtown. It gets you out of the house for the rest of the day.
If you get above 80 you get to be someone special in the hospital with more events.
You can also suffer random hits walking in the park so saving before going there might be worthwhile. Also, the playground has an event that hits rep hard, don't investigate the noise.
I'm sure there are other things. Someone a a starting week guide here to get you going off the right way.