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I am new to GIS software.

I have XYZ data in a text file (delimited text). The data is XY in 1m spacing, approx. 12km x 900m of data.

I want to find the elevation profile from a XY path.

In QGIS, i have managed to remove bulk of the unnecessary points to help reduce the time required for interpolation.

I tried using the profile tool to use an existing layer (a line I made), but the program stops responding instead of showing some process bar.

Do I need to do some TIN interpolation before trying to profile tool it again?

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You should first convert you point grid to a raster format using the Rasterize (vector to raster) tool. Then you can use the Profile Tool plugin to create the profile, as explained here: QGIS Profile Tool - Terrain Profile

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