Contour maps, Mapbox and (Q)GIS

Hi all, I'm looking for a bit of advice on GIS, QGIS and Mapbox and thought it time to make use of the WildLabs community's well of knowledge.

I'm trying to make a bathymetric contour map for a large section of the waters around Europe to help divers report sightings of particular species of interest.

I have dowloaded maptiles from https://portal.emodnet-bathymetry.eu/ and turned this data into contours in QGIS but am hitting filesize limits (or source limits - 15 max) when trying to get it into Mapbox.

I assume a vector based file format would generally be best for this but because the vectors in this map are so complex (10m contour interval) and the shape files are huge. So I have been trying to make a raster file instead (and I'd then just have the coutour map show at a single, high zoom level). However even using the smaller raster files I've made hits the filesize/source limit for Mapbox.

Anyone have any experience, tips or advice on this connundrum?

Cheers,

Remi

PS: hope it's alright to jump straight in with a new thread - I couldn't find any already covering any of this stuff.

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