Storage has a maximum growth as long as nothing changes in the block size limitations or average block timing, so you can pretty much plan ahead at 5GB/wk worst case, which is allowing for constant 25% higher block rate (extreme hashrate growth and luck) and spam/consolidation txs filling up the witness space fully.

This means 1TB every 4 years.

So right now you'd plan capacity for your node at 2TB. Realized rate is however closer to 3GB per week, so if you plan for the worst, you'll have a lot of slack.

Memory is only an issue if you aim to make block templates or for a watchtower. For a simple home node used for your L1 coin, you can tune it to use less memory. There's a guide for Bitcoin Core here.