Maximising what you can earn with existing equipment is beneficial because your not shelling out on more equipment and a larger van which is both expensive and less practical for parking and ongoing running costs.
Just concentrate on windows,UPVC cleans,conny roofs,solar panels and softwashing if you don't mind splashing sodium chloride around which all can be done with WFP.
You ll end up running around like a headless chicken if you start offering carpet cleaning services and other add ons like gardening unless you plan on employing even then it'll be a nightmare to manage your workload day today and the constant advertising.
It's usually better to concentrate on your core service rather than jack of all trades for peace of mind,regular,reliable work and it's generally less stressful.