If you're going for a short-term strategy and those are the prices that you think both coins will reach, then you're in for a surprise.

As of now, there's nothing in the horizon that could trigger a btc rally, let alone a bull run. But let's say it comes in the next few months, 15k sounds far-fetched, I'd go a bit lower, around the 12k. I take in cosideration the massive resistance that we'll encounter around the 10k, I think it's gonna take a bit of FOMO users to break that barrier, and from there, prices might stay around the 10k-12k since there won't that much hype anyways.

Either way, we should lower our expectations, it is very unlikely that we'll see a massive bull run. If anything we're in for a long bear season.