PIXMA MG3620 - inferior ink capacity

[Clarke]

Canon printer MG3620

April 5, 2024:  Bought cartidges PG 240XL and CL 241XL

I just print X-word puzzles in black only PRESET DRAFT mode.

3 puzzles per week  Apr thru Sept.  7 months X 4 weeks = 24 weeks X 3 puzzles = 72 printouts.

Plus approx 15 pages of draft documets - ALSO PRESET DRAFT BLACK MODE.

SO around 90 printed pages in all. 
(no color, no photos, no graphics… just x-word puzzles

Problem: this extra capacity, more expensive  black ink cartredge is ALREADY LOW.

What should I do about this?