Affordable bike repairs

Hello,

My bike is currently out of service because I need to replace some parts, but I’ve took it to a couple of places and they have quoted me a bit too much, around 90-100 or more. 100 is what the bike costed so it doesn’t make much sense to repair it if that’s the budget.

I’m wondering if there’s like a workshop or werkstatt where you can take it where maybe it’s DIY or with some guidance to lower the costs.

Thank you!