You can eventually get a way to increase your carry weight (at the cost of another inventory slot used) but at least for now the amount of inventory is fixed. It is a common request in an ever expanding early access so who knows, it could change, but as always don't assume it will. The weight increase is very useful when going for ores, especially anywhere within running distance.

If I do have to sail for ore mining I usually set up an outpost with a dock in a safe-ish biome nearby my mining area. Meadows always fit the bill, swamps are always a bad idea if you want to keep your boat, the rest may depend on your current progression and experience. That way i can spend a while over at the outpost mining a stockpile so it's actually worth making the trip in the boat when i have as much as i'm able to carry at the time. Sometimes i might have multiple main bases if the trip is long/annoying enough. Especially for some of the later game areas you have to travel farther for it can sometimes just be so much easier to go raid a nearby black forest or swamp for some cores to set up your smithing over there. The ore might not transfer but the items crafted from it, like weapons or armor, will. More than one main base can also be a necessity for farming reasons, a slightly unrelated note, but worth noting.