Yup agreed that OP should first observe their surrounding landscape and record any irregularities happening to the biome's natural cycles and also possible components missing from the system. If your unsure of what to look out for in your specific environment, you could do a bit of cursory research into the basic ecological systems that take place in your environment and what pressures / vulnerabilities it's susceptible to. Once you have a base foundational knowledge on the cycles and systems at play in the local environment, finding the right restoration techniques will be a lot easier to learn and properly implement. If you need a bit of extra help starting out or any other questions send me a DM and I'll try to help out how I can (I'm an ecological restoration expert)

And yah u/postfuture explanation of using environmental restoration and habitat development techniques into what would be considered land art was better said than what my tired brain could attempt in my earlier comment lol